Tread portion of an automobile tire



FIG. 1 is a perspective view of the top, front and left side of a tread portion of an automobile tire showing my new design, it being understood that the tread pattern repeats uniformly throughout the circumference of the tire thereof;

FIG. 2 is a front elevational view, the top plan view, bottom plan view and the rear elevational view being identical thereto;

FIG. 3 is a left side elevational view thereof, the right side elevational view being identical thereto;

FIG. 4 is an enlarged cross-sectional view thereof taken along the line 4—4 in FIG. 5; and,

FIG. 5 is an enlarged front elevational view thereof.

The elements shown in broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a tread portion of an automobile tire, as shown and described. 